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You can register using your Google, Facebook, or Twitter account, just click here.This is the problem with every digital instrument; you have to focus and read something, instead of simply being aware of a needle's position with your peripheral vision.I'd have to take my eyes completely off of the road to track a number instead of simply being aware of the position and movement of a larger "needle" via peripheral vision.
Is the cockpit to an L1011? It looks like it has 3 engines.View attachment 5323Training to remove Elgin dash
Just because we can measure an incoming data stream in binary language, doesn't mean we have to display it as a series of moving numbers. Digital instruments were "fashionable" back in the late '80's when everyone decided it was the "high-tech" look of the future, but I worked with the developers of an instrumentation system back then and we found it had a very serious problem - it doesn't relate well to human beings.
Imagine an instrument in front of you, say a tachometer that displays digits only. As the engine revs quickly, it takes you a moment to grasp what is going on under the hood. Your eyes catch the number "3", and a split-second later, the number "5". OK, fine - but your brain has to quickly interpret the fact that "5" is a larger number than "3", therefore the quantity being measured is rising. Then it has to decide whether that is good or bad. On the tach, is "5" safe? We have to think back to the owner's manual to decide whether "5" means something expensive is about to happen, and the relative time required to progress from "3" to "5" may mean disaster is already in the rear-view mirror . . . as in that cloud of oil smoke following you.
Water temperature is "240°" . . . again, good or bad? Is it increasing or decreasing? The same thing can happen with oil pressure - obviously "0" is not good, but where's the lower acceptable limit, and have you reached it yet? Remember, instruments can only tell you history - not always what's happening in the engine room at this very instant. Engineers try to damp out small excursions in the readings - you don't want to see your engine temperature rise and fall as the thermostat opens and closes - or read every slosh in your fuel tank - that would really be confusing.
The primary purpose of any kind of instrument display is communication - not necessarily with other binary devices, but with that grey lump of flesh between our ears. Our brains have to recognize and interpret inputs, and that takes a bit of effort. Scanning the instrument panel should be simple - communicating instant information. Most designers of instrumentation systems subscribe to the convention that all the needles pointing up means you are in good shape - with some allowance for a bit right or left of vertical saying all is well. A needle on the peg - either maxed or dead - is VERY bad news. We determine this by its relative position on the scale - we can go back and read off the numbers if we need to, but a quick scan of the information presented should instantly communicate what's happening out front, and which is important to us.
With just a glance, which means more to YOU:
or:
The oilfield instrumentation company I worked with had produced a terrific panel of extremely accurate LCD digits, but in an emergency, numbers speeding by on the screen were not helpful. They had to put a status bar alongside each digital display simply to inform the operator whether the numbers were increasing or decreasing because a spinning four-to eight digit display was meaningless. In a disaster scenario, it was a matter of life and death - not just whether you were going to void your warranty. They ended up with a panel that had at least two readouts for every function, one digital and one simulated analog, plus color-coding that would flash yellow or red to draw attention to the most critical changes taking place. All of this was to replace a simple set of needles and numbers. It just didn't work well with humans.
There is a good reason that wristwatches that once went to digital displays came back to three hands. Sure, if you were asked the time you could say "It's 11:45:42." with great authority - but you had to think about it for an instant to determine it was just under 15 minutes 'til lunch. That's the problem with digital readouts - humans are relational in their thinking - we need to see numbers in a context that is meaningful. If the temperature gauge is in the green, that's good. If it says "240°" we have to think about pressure and bring in a couple of Gas Law equations to understand something's about to let go. Sometimes an analog display is "close enough". It's how we interpret things quickly.
Digital displays don't even work for watches - even less well for mission-critical instruments.
The only time I'll even look at mine is when I get on the highway, merge into traffic, 'click' on the cruise control, and finally, glance down at the speedo to do some quick calculations on the speeding fine levied at that speed over the posted if I get caught (safety in numbers, but an Elio will stand out like a sore thumb). Really though, the design (Elgin) doesn't bother me at all, and is actually starting to grow on me.
One fundamental of marketing and sales that seems to have been overlooked by EM: You sell the product your customers WANT, not what you think they should have.